Azolla is used as biofertilizer because

Azolla is used as a biofertilizer because it

Plant used as biofertilizer

Azolla is used as biofertilizer as it has

Some blue green algae are used as biofertilizers because they

Some blue green algae are used as biofertilizers because they

Some blue green algae are used as biofertilizers because they

Some blue green algae are used as biofertilizers because they

Assertion a : Azolla is used as biofertilzer in rice fields Reason r: Azolla contains nitrogen fixing cyanobacteria in its root nodules

Assertion a : Azolla is used as biofertilzer in rice fields Reason r: Azolla contains nitrogen fixing cyanobacteria in its root nodules